Fracture Toughness and Fatigue Behavior of T7451 Al-Zn-Mg-Cu Alloy Thick Plate

2014 ◽  
Vol 788 ◽  
pp. 223-230 ◽  
Author(s):  
Li Li Wei ◽  
Qing Lin Pan ◽  
Yi Lin Wang ◽  
Lei Feng
Keyword(s):  
Mechanical Property ◽  
Fracture Toughness ◽  
Fatigue Resistance ◽  
Fatigue Behavior ◽  
Plate Thickness ◽  
Transgranular Fracture ◽  
Cu Alloy ◽  
Tensile Fatigue ◽  
Strain Fracture ◽  
Plain Strain

The mechanical property, fracture toughness and fatigue behavior of T7451 Al-Zn-Mg-Cu alloy thick plates in different orientations and with various thicknesses were investigated by means of tensile, fatigue and plain strain fracture toughness testing. And the microstructures and fracture morphologies were analyzed with optical microscopy and scanning electron microscopy. The results showed that the samples in longitudinal (L)-transversal (T) orientation possessed better mechanical property, fracture toughness and fatigue resistance than that in T-L orientation. Fractography and optical microanalysis clearly demonstrated that the feature of recrystallized grains is the decisive factor for this anisotropy. On the other hand, values of strength and fracture toughness decreased with the increase of plate thickness, but their fatigue crack growth rate became slower. Combined with the fractography analysis, the increase of recrystallization degree and the coarser grains in the thicker plate should be the main reason for the detrimental to the strength and toughness properties since the main fracture mechanism changes from ductile transgranular fracture to intergranular failure. However, these coarse recrystallized grains play an advantageous role for fatigue resistance from crack deflection and closure perspectives.

scholarly journals Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2815
Author(s):  
Yu Hang Yang ◽  
Jun Yi ◽  
Na Yang ◽  
Wen Liang ◽  
Hao Ran Huang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fatigue Resistance ◽  
Metallic Glasses ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
High Toughness

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

Influence of Microstructure on the Fracture Mechanism and Mechanical Behavior in 7010 and 7150 Alloys

2006 ◽  
Vol 324-325 ◽  
pp. 463-466
Author(s):  
Xi Gang Fan ◽  
Da Ming Jiang ◽  
Chang Li Wang ◽  
Yong Liang Guo ◽  
Xing Qiu Liu
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Fracture Behavior ◽  
Compact Tension ◽  
Transgranular Fracture ◽  
Plane Strain Fracture Toughness ◽  
Ageing Treatment ◽  
Cu Alloys ◽  
Intermetallic Particles ◽  
Strain Fracture

The effect of ageing treatment and coarse intermetallic particles on the compromise between the toughness and the yield strength of 7010 and 7150 aluminum alloys (Al-Zn-Mg-Cu alloys) are investigated. Plane-strain fracture toughness tests were performed on the compact-tension specimens of L-T orientation. The fracture toughness of 7010 alloy was higher than that of 7150 alloy at the same ageing treatment. The 7150 alloy contain a greater amount of coarse Cu-bearing particles, which deteriorate the fracture behavior and decrease the ageing hardening ability of the alloy. The toughness of the both alloys increased greatly for the overaged condition as compared to that for the T6 condition. Two dominant mechanisms of failure occur: microvoid-induced transgranular fracture and intergranular fracture modes, and the former becomes more important in the overaged ageing conditions.

Fracture Toughness of Structural Members

2012 ◽  
Vol 726 ◽  
pp. 195-202 ◽  
Author(s):  
Andrzej Neimitz
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Reference State ◽  
Finite Strains ◽  
Structural Members ◽  
Local Approach ◽  
Strain Fracture ◽  
Out Of Plane ◽  
Plain Strain

Abstract. In the paper several formulae to compute the fracture toughness are presented. The formulae include either parameter characterizing the in-plane constraint or out-of-plane constraint or both. The formulae are based on different assumptions and approaches to fracture mechanics. Namely, small or finite strains were assumed, global or local approach was adopted. In all cases the standard, plain strain fracture toughness was used as a reference state.

scholarly journals The impact of the temperature and exploitation time on the tensile properties and plain strain fracture toughness, KIc in characteristic areas of welded joint

2018 ◽  
Vol 12 (46) ◽  
pp. 371-382 ◽  
Author(s):  
Simon Sedmak ◽  
Ivica Čamagić ◽  
Aleksandar Sedmak ◽  
Zijah Burzić ◽  
Mihajlo Aranđelović
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Welded Joint ◽  
Strain Fracture ◽  
Plain Strain ◽  
The Impact

scholarly journals Effect of temperature and exploitation time on tensile properties and plain strain fracture toughness, KIc, in a welded joint

2018 ◽  
Vol 9 ◽  
pp. 279-286
Author(s):  
Ivica Čamagić ◽  
Simon Sedmak ◽  
Aleksandar Sedmak ◽  
Zijah Burzić ◽  
Mladen Marsenić
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Welded Joint ◽  
Effect Of Temperature ◽  
Strain Fracture ◽  
Plain Strain

Fatigue Behavior of Chromium Steel Surface Deposits

1992 ◽  
Vol 114 (2) ◽  
pp. 201-207 ◽  
Author(s):  
A. Barbangelo
Keyword(s):  
Fracture Toughness ◽  
Steel Surface ◽  
Fatigue Behavior ◽  
Sharp Decrease ◽  
Chromium Steel ◽  
Stress Intensity Factor Range ◽  
Plane Strain Fracture Toughness ◽  
Strain Fracture ◽  
The Impact ◽  
Filler Metals

A study of fatigue behavior has been carried out using a set of commercial surfacing chromium steels in the state of deposits postheated at 350°C. The set consisted of various filler metals with different contents of chromium, nickel, carbon, and carbide-forming elements. It has been found that all the deposits examined are characterized by very close values of their fatigue crack growth threshold, ΔKth. In each material, as the stress intensity factor range is varied, three different propagation kinetics are observed, probably triggered by the presence of trapped hydrogen. Fracture toughness and, even though less strictly, subcritical growth by fatigue depended on the vanadium or columbium contents of each material, rather than on the other alloying elements. By adding vanadium or columbium and increasing the columbium content, one obtains a sharp decrease in plane-strain fracture toughness. No interdependence has been found between the values of the fracture toughness and the impact toughness of each material. This apparent discrepancy between the two kinds of toughness can be explained by using a distance criterion for failure at the tips of sharp cracks.

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